Abstract
Aims: Evaluate the amount of anchorage loss of the lower posterior teeth 2nd premolar and first molar when used as anchorage teeth for retraction of canine bilaterally by using lace back technique after extraction of first premolar in sever crowding cases. Materials and Methods: Two groups of brackets, one of them labial (conventional) were bonded on the labial aspect of metal teeth except 4 4 typodont by special adhesive and other groups lingual brackets also bonded in the same teeth lingual surface and two types of light or low gauge arch wire Niti , twisted multi strand for sliding the canines retraction by using elastomeric ring with ligature wire active lace back once with labial and other with lingual technique. Results: There is no significant difference between twisted multi strand wire when ligated on the teeth in both lingual technique and labial technique. Significant difference when used Niti wire on lingual technique when compared with the same type of wire when ligated on labial technique and significant difference with twisted multi strand when ligated on teeth in lingual technique. Conclusion: Anchorage loss decreases with twisted multi strand wire because the friction increased between arch wire and base of bracket in both labial and lingual technique and decreased with Niti wire specially when used in lingual techniques
Highlights
Some authors believe that the use of light continuous force consider the most effective way to move the teeth in early stage of treatment
Canine retracted with lace back until anterior posterior crowding was resolved.(2) Anchorage is an important consideration when planning tooth movement, un wanted tooth movement known as loss of anchorage can have determined effect on the treatment outcome.(3) Optimal anchorage control is essential for successful orthodontic treatment.(4) Anchorage loss is one of the side effects of orthotheropy.(5) To obtain the desired results of closing spaces within www.rafidaindentj.net
Arch, it is essential to control the amount of incisors retraction versus premolar and molar protraction.(6) The orthodontist must plan how to close any space that is not devoted to relief sever crowding whether anterior teeth retraction and posterior teeth protraction.(7) Canine retraction is one of the basic technique in orthodontic treatment.(8) Successful retraction requires conflict control of force magnitude.(6) Researchers have always been interested in determining efficient methods of retraction canines.(9) Canines can be retracted by sliding,(9-15) sliding mechanics involve moving bracket along arch wire, so friction plays a role in sliding
Summary
Some authors believe that the use of light continuous force consider the most effective way to move the teeth in early stage of treatment. This is due to comfortable for the patient and minimizing the threat to anchorage come from the influence anterior bracket tip that puts demand upon anterior posterior anchorage.(1) The canines are key stones of occlusion so the canine intended to slide distally guided by continuous wire, lace back are used to control canines and retract them sufficiently to allow alignment of incisors. Typodont system can be use in orthodontic practice to show possible effects of variable factors on canine position and rate of movement during the retraction.(16)
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